silent run in cron

install

 
 cp git-backup /usr/local/bin
 cp git-backup.conf /etc
-sed -i '/git-backup$/c\' /etc/crontab
-echo "00 2    * * *   root    git-backup" >> /etc/crontab
+sed -i '/git-backup/c\' /etc/crontab
+echo "00 2    * * *   root    git-backup > /dev/null" >> /etc/crontab
 
 git-backup --init